Early Tree Leaf Drop?

An observation this year that I haven't recalled seeing before.

There are two Norway maples near my property that are experiencing sudden leaf drop independent of other maple/maple like trees. The leaves have suddenly shriveled up, turned brown, and have been dropping onto my lawn. The nearby Boxelder trees, Ginko, Redwood, and other trees appear unaffected. While we have had some high humidity and warm temperatures, there has been semi-frequent rain and some days of relief.

Have you seen any early leaf drop yourself this year? Got any thoughts why only one kind of tree might be showing signs while others are not?

I hope to learn something new!

I had the exact same thing happen with my two Suriname cherries. One dropped all its leaves (as they do for winter) and the other didn't. They were planted next to each other on the very same day and receive the same care (youngish trees, 7-ish years old). Both are now throwing buds. Go figure.

I don't know about you but where I am, "weird" is an understatement for how the weather has been. We had a hot snap and now everything is leafed out and flowering. Then a bomb cyclone came out of the South Atlantic full of polar air, I'm hoping the fruit flowers survive. The snow peas, on the other hand, are having the time of their lives and I'm getting a bumper crop, daikon radish too. Meanwhile, the climbing striped fava beans, which are usually a reliable winter crop here, have tiny 'i'm so stressed' leaves and almost no flowers are setting beans. A weird year.